Electromagnetic burglar-alarm



I BIGGAR, BLOOD & GRISWOLD.

` Burglar Alarm. N0. 79,895.l I Patented July I4, 1868.

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UNITED STATES PATENT OEEIoE.

WILLIAM J. BIGGAB, JOHN O. BLOOD, AND DEL M. GRISWOLD, OF OONNEAUT, OHIO.

ELECTRQIVIGNETIC BURGLARNALARIVE.

Specification forming part of Letters Patent No. 79,895, dated July 14, 1868.

To all whom 'it 'may concern:

Be it known that we, WILLiAM J BIGGAR, J OEN G. BLOOD, and D. M. GRIswOLD, Ot' Gonneaut, in the county of Ashtabula and State oi' Ohio, have invented a new and useful linprovenient in Magnetic Burglar-Alarms; and we do hereby declare that the following is a full, clear, and exact description thereof, which will ena-ble those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in whichv Figure 1 is a side elevation of our improved magnetic burglar-alarm 5' Fig. 2, a detached View of a circuit-breaker connected with a win dow. Fig. 3 is aplan or top View Oi' the instrument.

Similar letters of reference indicate correspondin g parts.

This invention relates to improvements in the construction and arrangement of an instrument for giving an ala-rm, on the entrance of aburglar into a house, by means Ofamagnetic circuit, and it consists in connecting copper Vwires with a battery to run through the house,

and having circuit-connections attached to the doors and windows, so that when a window or door is opened by a burglar the break of the circuit sha-ll release the armature from the magnets, and thus act upon an alarm by striking a bell and lighting a duid-lamp Or candle in the room where the instrument is placed, as hereinafter more particularly described.

On a suitable base, A, are placed two coil magnets, B B, provided with an armature, O, attached to a frame, D, pivoted at ce, and connected with a bent wire lever-catch, b, pivoted at one end at c, which catch is formed so as to engage pins d d on the side of a wheel, E, and hold it fast when the circuit is complete and the armature is connected with the magnets, but is released from the pins when the circuit is broken and the armature is released from the magnet-s, beingdrawn therefrom by a spiral spring, e, when the break in the circuit Occurs, as hereinafter described.

The electro-magnetic circuit is formed by a copper wire, gg, which extends through a building to be protected against burglars, and provided with circuit-connections h h, Fig. 2, and breakers at the windows and doors, one end of the wire being connected with the positive and the other with the negative pole of the battery. The wire being thus arranged throughout a house and the proper connections made with the magnets, the operation thereon is Obvious, and when a breakoccurs in the circuit by the opening Aof a door or window hy a burglar the armature O will be released from the magnets and drawn by the spring c, when the lever-catch b is thrown from one of the pins d and releases the wheel E held by the catch, so that it shall be turned by means of a heavy weight, F, attached to a cord, j, ruiming over the axis-G of the wheel E, by the turning of which the pins d d strike the handle m of a clapper, H, of the bell K, and thus sounds an alarm.

In connection with the instrument is also provided, as an additional means of alarm, a self-lighting apparatus Operated at the same time as the bell-alarm.

The lamp L is set alongside of a` stand-post, M, on the top ofwhich is an elbow-lever, N, which holds a match, n. The lever N is provided with a rod, p, the outer end of which catches on a projection, r, on the peripheryof the wheel E, to set it for lighting'the lamp when kthe electro-magnetic circuit is complete, and when the Wheel is released, as before de scribed, the rod r is thrown Off and the elbowlever N is drawn around by the spiralspring s attached to the post M, when the match is brought in contact `with a sanded rubber, O, and ignited, and thence carried to the wick of the lamp to light it.

Having thus described our invention, we claim as new and desire to secure by Letters Patent- The combination and arrangement of the magnets B B, armature O, pivoted frame D, wheel E, provided with pins d and catch o',

hinged lever-catch b, bell K, hammer H, handle m, spiral springs s e, catch p, swinging holder N, rubber O, stand M, lamp L, weight F, cord j, shaft Gr, wires g, and circuit connections and breakers, all substantially as and for the purpose herein shown and described.

WM. J. BIGGAR. JOHN O. BLOOD. DEL M. GRISWOLD. Witnesses: Y G. R. GODDARD,

H. W. SIMoNs. 

